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If S.D of x underset(1), x underset(2) ,...

If S.D of `x underset(1)`,` x underset(2)` ,........,`xunderset(n)` is`sigma` then the S.D of `-x underset(1)`,- `x underset(2)` ,........,`-xunderset(n)`is

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The correct Answer is:
`sigma`
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